An experimental vaccine being developed by AstraZeneca and Oxford University against the new coronavirus produced an immune response in early-stage clinical trials, data showed on Monday, preserving hopes it could be in use by the end of the year. The vaccine, called AZD1222, has been described by the World Health Organization's chief scientist as the leading candidate in a global race to halt a pandemic that has killed more than 600,000 people. The vaccine from AstraZeneca and Britain's University of Oxford prompted no serious side effects and elicited antibody and T-cell immune responses, according to trial results published in The Lancet medical journal, with the strongest response seen in people who received two doses.
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